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1,572 api developer jobs at 534 companies in Rockville, MD

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Lead AI/API Engineer
Washington, District of Columbia, United States
RemoteFull Time
Educology Solutions
Educology Solutions: A privately held IT services firm modernizing cloud, health, cybersecurity, and training systems for public-sector agencies.
8+ YOE8+ years software engineering with 5+ years hands-on API/integration engineering; deep C#/.NET proficiency; Azure API Management, OpenAPI, OAuth/OIDC, CI/CD, and observability experience; technical leadership and mentoring.
C#, .NET, Azure API Management, OpenAPI, Swagger, OAuth 2.0, OpenID Connect, Azure DevOps, GitHub, Azure Monitor, Application Insights, Log Analytics
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3mo
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KONG/API GATEWAY SURGE ENGINEER
United States or Washington
HybridFull Time
Constellation West
Constellation West: A service-disabled veteran-owned women-owned small business providing cybersecurity and information solutions to federal agencies.
Expertise with Kong Enterprise or comparable API gateways, API gateway implementation and migration, gateway policies, plugin configuration, developer portals, API security; experience with Kubernetes, OpenShift, Docker, GitOps, CI/CD, OAuth/JWT/OpenID Connect; bachelor’s preferred.
Kong Enterprise, Kong, Apigee, IBM API Connect, MuleSoft, Azure API Management, AWS API Gateway, Kubernetes, OpenShift, Docker, GitOps, CI/CD, OAuth, JWT, OpenID Connect
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Senior API/Java/Python Developer
Arlington, Virginia, United States
$116k-$169k/yr OnsiteFull Time
Vantor
Vantor: Forging the new frontier of spatial intelligence.
5+ YOEBachelor's degree and 5+ years experience; active TS/SCI with CI Polygraph; proficiency in Java/Python and frameworks; API design (REST, GraphQL, SOAP); database and version control knowledge; U.S. Person status required.
Java, Python, Spring Boot, Flask, Django, Postman, Swagger UI, Git, Docker, Kubernetes, AWS, Azure, GCP, PostgreSQL, MongoDB, MySQL
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2mo
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API Systems Engineer
Vienna, Virginia, United States
$96k-$123k/yr HybridFull Time
Navy Federal Credit Union
Navy Federal Credit Union: Member-owned, not-for-profit credit union providing banking, lending, and investment services to servicemembers, veterans, DoD personnel, and families.
Expert Java, JEE, web services, APIs, Spring Boot, cloud architecture, API security, and Agile expertise; strong troubleshooting and communication skills; bachelor's degree or equivalent experience.
Java, JEE, Web Services, APIs, SOAP Services, RESTful APIs, JSON, Spring Boot, Istio, Service Mesh, Spring Framework, Open API Specification, RAML, MCP, A2A, LLMs, Azure, AWS, GCP, Pivotal, Tanzu, Tanzu Kubernetes Grid, k8s, OAuth, SAML, JWT, OpenID Connect, Agile, SAFE, Salesforce, Oracle HCM, PeopleSoft, CRM, Dynamics, Azure DevOps
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Senior API Systems Engineer
Sterling or Falls Church
$150k-$254k/yr OnsiteFull Time
BAE Systems
BAE SystemsLSE: BA.: Global defense, aerospace, and security technology.
10+ YOEBachelor’s or master’s degree in STEM and 10+ years of relevant experience required. Requires Security+ CE, 5+ years with API gateways, cloud, programming, containers, testing, and security expertise.
API Gateway, Windows, COTS, Java, Python, C#, AWS, Microsoft Azure, Google Cloud Platform, Docker, Kubernetes, Microsoft ServiceNow, MuleSoft, Apigee, Istio, Linkerd, REST APIs, GraphQL APIs, ETL, Oracle Cloud, IBM Cloud
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Oracle Integration & API Engineer
United States or Reston
$99k-$207k/yr RemoteFull Time
CACI
CACINYSE: CACI: Provider of specialized IT and mission-critical government services.
7+ YOEU.S. citizenship, Public Trust eligibility, bachelor's degree and 7 years' relevant experience, 7+ years in integration/API engineering, and 5+ years with Oracle Integration Cloud or similar platforms.
Oracle Fusion Cloud HCM, Oracle Integration Cloud (OIC), Oracle SOA Suite, REST, JSON, XML, OAuth 2.0, OpenAPI 3.0, SFTP, HCM Extracts, HDL, HSDL, BI Publisher, CI/CD, Git, Python, Groovy, JavaScript, Oracle Cloud Infrastructure (OCI), FIPS 140-3, SCIM 2.0, SAFe Agile
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Oracle Integration & API Engineer
United States or Reston
$115k-$252k/yr RemoteFull Time
CACI
CACINYSE: CACI: Provider of specialized IT and mission-critical government services.
7+ YOEU.S. citizenship, Public Trust eligibility, bachelor's degree and 7 years' relevant experience, 7+ years in integration/API engineering, 5+ years with OIC or similar tools, and REST, JSON/XML, OAuth, and OpenAPI expertise.
Oracle Fusion Cloud HCM, Oracle Integration Cloud (OIC), Oracle SOA Suite, REST, JSON, XML, OAuth 2.0, OpenAPI 3.0, HCM Extract, Oracle HCM Data Loader (HDL), HSDL, BI Publisher, SFTP, Git, FIPS 140-3, SCIM 2.0, Python, Groovy, JavaScript, Oracle Cloud Infrastructure (OCI)
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Application Engineer 4 (API)
Linthicum Heights, Maryland, United States
OnsiteFull Time
Wyetech
Wyetech: Computer engineering services firm supporting federal government missions.
Strong Python, backend development, Docker, Django/Flask, MongoDB/MariaDB, RESTful APIs, microservices, and integration with UI front-ends.
Python, Django, Flask, Docker, MongoDB, MariaDB, REST, JSON, AWS, XML, Jira, Confluence, Git
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1mo
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Full Stack API Developer- TS/SCI with Polygraph
Chantilly, Virginia, United States
$187k-$252k/yr OnsiteFull Time
General Dynamics Information Technology
General Dynamics Information TechnologyNew York Stock Exchange: GD: Provider of enterprise IT services and defense solutions.
15+ YOE15+ years related experience; BA/BS in IT or equivalent; TS/SCI with polygraph clearance; US citizenship; Java, Spring Boot, Mongo, AWS, JavaScript/TypeScript, Angular, REST, ArangoDB, JIRA; less than 10% travel.
ArangoDB, Atlassian JIRA, Java, Spring Boot, Mongo, AWS, JavaScript, TypeScript, Angular, REST, Elasticsearch, OAuth 2.0
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Application Engineer (API) - Level 4
Linthicum, Maryland, United States
OnsiteFull Time
All Capital Solutions, Inc.
All Capital Solutions, Inc.: Private IT engineering contractor providing cybersecurity, software engineering, cloud, and mission-operations support to government clients.
4+ YOERequires Python, Docker, Django or Flask, MongoDB or MariaDB, REST endpoint and microservice development, plus 4–12 years of experience depending on education.
Python, Docker, Django, Flask, MongoDB, MariaDB, AWS, JSON, XML, Jira, Confluence, Git
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3mo
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Software Engineer (Back-end, API, Python)
Fort Meade, Maryland, United States
OnsiteFull Time
Themis Insight
Themis Insight: Private consulting firm providing business, IT, and analytics solutions to National Security clients.
4+ YOETS/SCI with polygraph required; Bachelor's in Computer Science or related (or 4 years SWE experience substitution); 4 years IT application systems experience; 2 years developing core applications; Python experience.
Python
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3mo
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Senior Developer
Rosslyn, Virginia, United States
$222k/yr OnsiteFull Time
ActioNet
ActioNet: Woman-owned IT solutions and managed services provider.
7+ YOESecret clearance, 7–12 years software development experience, bachelor’s degree in CS/IT, expertise in Python/Java/C#, Agile/SAFe, microservices and API development, cloud and system integration; strong leadership and troubleshooting skills; certifications preferred.
Python, Java, C#, Agile, Scrum, SAFe, microservices, API, AWS, Microsoft Azure, GitHub, Kubernetes, Docker, big data platforms, TOGAF 9
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3mo
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OneStream Developer
Washington, District of Columbia, United States
$85k-$130k/yr OnsiteFull Time
Empirical
Empirical: Disadvantaged small-business CPA and federal consulting firm providing financial, audit, technology, and advisory services to government agencies.
3+ YOE3+ years OneStream development experience, bachelor's degree in related field, proficiency in VB.Net and SQL, knowledge of C#, Python, REST APIs, ERP integrations, and ability to obtain U.S. federal security clearance.
OneStream, VB.Net, SQL, C#, Python, REST API, SAP, Oracle Financials, Momentum
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2mo
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.NET Developer
Herndon, Virginia, United States
$65k-$80k/yr RemoteFull Time
BDR Solutions
BDR Solutions: Service-disabled veteran-owned small IT services firm modernizing health, social-service, and disaster-relief systems for U.S. federal agencies.
5+ YOEU.S. citizen able to obtain Public Trust, Bachelor's in IT or equivalent experience, 5+ years .NET development experience including C#, Webforms/MVC/Web API, ADO.Net/Entity Framework, web services, and Agile/Scrum.
.Net 4.x Framework, C#, Webforms, MVC, Web API, ADO.Net, Entity Framework, SOAP, XML, REST, JSON, jQuery, Bootstrap, Ajax, CSS, Microsoft Azure, DEVOP/CICD Pipeline, GITHUB, GIT, SQL, SSDT, MS SSRS, .NET Core Framework, SAFe Agile
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JIRA Developer
Washington, District of Columbia, United States
$112k-$150k/yr OnsiteFull Time
Technica Corporation
Technica Corporation: Veteran-owned federal IT services firm delivering engineering, cybersecurity, software, and technology solutions to government agencies.
8+ YOEActive Top Secret clearance with SCI eligibility; Bachelor's degree in IT or related field; 8+ years JIRA development experience; proficiency in Groovy, Java, REST APIs, JSON, Jira Assets, SQL, JQL, and workflow automation.
Jira, Jira Service Management, Groovy, ScriptRunner, Java, REST API, JSON, Jira Assets, SQL, JQL
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Full-Stack Engineer 4 (Python, GO, API, AWS) (Cloud Operations Resilience Engineering)
McLean, Virginia, United States
$197k-$225k/yr OnsiteFull Time
Capital One
Capital OneNYSE: COF: A technology-driven bank providing diverse financial services.
4+ YOEBachelor's degree in Computer Science or related quantitative field; 4+ years software engineering experience; 2+ years public cloud experience; proficiency in Python, Go, AWS, APIs, and microservices.
Python, Go, AWS, RDBMS, NoSQL, JavaScript, TypeScript
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3mo
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AI Automation Engineer / Developer
Frederick, Maryland, United States
OnsiteFull Time
Konare Law
Konare Law: Boutique U.S. immigration law firm representing individuals, families, and businesses in visas, asylum, citizenship, and removal defense.
Strong software development skills (e.g., Python, JavaScript/TypeScript), hands-on experience with AI tools (Claude) and automation, API integration experience, discretion with confidential client data, and ability to deliver production systems.
Claude, Python, JavaScript, TypeScript, APIs
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Senior Database Developer
Herndon, Virginia, United States
$50k-$290k/yr OnsiteFull Time
The Swift Group
The Swift Group: Invisible by Design. Impossible to Ignore.
5+ YOERequires 5+ years of relevant experience, PostgreSQL and SQL database expertise, API development, data processing, AWS knowledge, Agile experience, US citizenship, and active TS/SCI with polygraph clearance.
Amazon Web Services (AWS), AWS RDS for PostgreSQL, PostgreSQL, SQL, Power BI, Application Programming Interfaces (APIs), Jira, Docker, Kubernetes, Terraform, CloudFormation, Tableau
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